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经营范围
发明名称
Improvements relating to electron discharge tubes or thermionic valves
摘要
申请公布号
GB375112(A)
申请公布日期
1932.06.23
申请号
GB19310021790
申请日期
1931.07.30
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H01J19/38
主分类号
H01J19/38
代理机构
代理人
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地址
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